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【单选题】
下列关于双子叶植物叶的描述，错误的是（）。A.
叶脉中的维管束常常没有形成层，所以不能长粗
B.
木质部靠近上表皮，韧皮部靠近下表皮
C.
大的叶脉维管束下方常有发达的机械组织，因此叶片的下面常有显著的凸出
D.
最小的叶脉，木质部可能仅为一个螺纹管胞
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【单选题】______ kinds of matter in the world.
A.
There is a few million
B.
That there are millions
C.
There are a few million
D.
It is millions
【简答题】请各位同学完成下述作业: 大家手写答案好,拍照上传到系统即可
【单选题】China is one of the few countries in the world that have devoted great efforts to________ world peace.
A.
preserving
B.
conserving
C.
possessing
D.
reserving
【单选题】It can be concluded that
A.
raising the world' s temperature only a few degrees would not do much harm to life on earth
B.
lowering the world' s temperature merely a few degrees would lead many major farming areas to disaster
C.
almost no temperature variations have occurred over the past decade
D.
the world' s temperature will remain constant in the years to come
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