It is extremely hot this summer. __________, many people say it has been the hottest in the past 30 years.
A. Frequently B. Actually C. Fluently D. Gradually
It was the truth that the black reached a stage_______ they had almost no rights at all in the past.
A. when B. where C. which D. that
—At the school sports meeting, many students are full of________, but I’m always exhausted.
—You’d better take more exercise.
A. strength B. force C. energy D. power
假设你是某中学高三(1)班的班长李华，你们全班同学在周末期间开展了“体验一天低碳生活”的活动。请你根据以下四幅图的先后顺序，写一篇英文短文，介绍同学们这一天的体验活动，向学校“英语园地”投稿。词数120词左右。内容要点如下：
1、根据图片内容记叙一天的活动；
2、简单地描述你的感受。
3、提示词：disposable chopsticks 一次性筷子
注意：开头已给出，但不计入总词数。
The students in our class took part in an activity of “Experience a Low-carbon Day” at the weekend.
Dear Mr. Black，
I’m very thank to you for inviting me to stay with you in the come summer vacation. I have been dreamed of seeing you again so that I can get help from you in my English learning. And I’m afraid I cannot go to your place in this summer. I’ve promised my grandmother, she lives in the country, to spend this summer with her. She misses me too much that I find difficult to refuse her request. I’m busy preparing for my examinations in present. I planned to visit you in winter if it’s convenient to you.
Best wishes.
Yours truly,
Li Ying
A. Attention must be paid to environmental factors.
B. Principles of curing cancers.
C. It will take long to find perfect cures.
D. An important discovery in the research.
E. The causative factor of cancer is very clear.
F. The survival rate differs among patients with various cancers.
1.___________
“I have great confidence that by the end of the decade we’ll know in vast detail how cancer cells arise,” says microbiologist Robert Weinberg, an expert on cancer. “But,” he cautions, “some people have the idea that once one understands the causes, the cure will rapidly follow. Consider Pasteur. He discovered the causes of many kinds of infections, but it was fifty or sixty years before cures were available. ”
2.____________
This year, 50 percent of the 910,000 people who suffer from cancer will survive at least five years. In the year 2020, the National Cancer Institute estimates, that figure will be 75 percent. For some skin cancers, the five-year survival rate is as high as 90 percent. But other survival statistics are still discouraging—13 percent for lung cancer, and 2 percent for cancer of the pancreas (胰腺) .
3.___________
With as many as 120 varieties in existence, discovering how cancer works is not easy. The researchers made great progress in the early 1970s, when they discovered that oncogenes, which are cancer-causing genes, are inactive in normal cells. Anything from universe rays to radiation to diet may activate an inactive gene, but how remains unknown. If several oncogenes are driven into action, the cell, unable to turn them off, becomes cancerous.
4.____________
The exact process involved is still mysterious, but the likelihood that many cancers are initiated at the level of genes suggests that we will never prevent all cancers. “Changes are a normal part of the evolutionary process,” says oncologist William Hayward. Environmental factors can never be totally eliminated; as Hayward points out, “We can’t prepare a medicine against universe rays.”
5.____________
The prospects for cure, though still distant, are brighter. “First, we need to understand how the normal cell controls itself. Second, we have to determine whether there are a limited number of genes in cells, which are always responsible for at least part of the trouble. If we can understand how cancer works, we can reduce its action. ”
