四级作文可以参考阅读的句型吗【一】
1。 It is considered /thought that人们（有人，大家）认为
2。 It is generally /usually accepted /agreed/recognized that普遍（一般，通常）认为
3。 It is believed that有人（人们，大家）相信
4。 It is well—known that大家知道（众所周知）
5。 It is said that据说（有人说）
6。 It is learned that据闻（悉）
7。 It is supposed that据推测
8。 It is estimated/predicted/calculated that据估计（预计）
9。 It must be pointed that必须指出
10。 It is reported that据报道
11。 It must be admitted that必须承认
12。 It will be seen that可见（可以看出）
13。 It will be seen from this that由此可见
14。 It is understood that不用说（都知道）
15。 It can not be denied that无可否认
16。 It has been proved/demonstrated that已经证明
17。 It may be confirmed that可以肯定
18。 It may be safely said that可以有把握地说
19。 It is sometimes asked that人们有时会问
20。 It is expected that/hoped that人们希望
21。 When it comes to要说到，要谈及
四级作文可以参考阅读的句型吗【二】
In short, it can be said that
四级作文可以参考阅读的句型吗【三】
A constantly doing memory work
B making frequent adjustments
C going through specific training
D taking part in various mental activities
注：考第三段末句。
Many experts are so convinced of the benefits of challenging the brain that they are putting the theory to work in their own lives. The idea is not necessarily to learn to memorize enormous amounts of information, says James Fozard, associate director of the National Institute on Aging. Most of us dont need that kind of skill. Such specific training is of less interest than being able to maintain mental alertness. Fozard and others say they challenge their brains with different mental skills, both because they enjoy them and because they are sure that their range of activities will help the way their brains work.
23. The findings of James and other scientists in their work _________.
A remain a theory to be further proved
B have been challenged by many other experts
C are practised by the researchers themselves
D have been generally accepted
注：第三段首句中的theory等同于findings。
四级作文可以参考阅读的句型吗【四】
11．一方面，全世界目前每年向大气中排入50多亿吨二氧化碳；另一方面，森林被大量砍伐，大气中本应为绿色植物吸收的二氧化碳没有被吸收，过多的二氧化碳就像一层厚厚的玻璃遮在地球上空，使得地球变成了一个大暖房。（本小题2分，答出一点给1分，意思对即可给分。）
12．利用生物技术大量培养浮游生物，用细菌和藻等微生物固定二氧化碳；用现代的技术将空气中的二氧化碳分离、回收、液化，把二氧化碳储存起来；将二氧化碳变成一氧化碳。（本小题3分，答出一点给1分，意思对即可给分。）
13．(1这一点是指将二氧化碳变成一氧化碳。（本小题2分）
(2例举法国化学家把二氧化碳变成一氧化碳的例子，是为了说明应用这项技术获得一氧化碳的成本太高，只是在理论上有价值，不能进入实际应用，要想把二氧化碳变成一氧化碳还需努力。（本小题2分，意思对即可给分。）
14．围绕二氧化碳有利这一方面发表自己的看法。（本题3分，言之成理即可给分。）
