题目内容

As regards putting an end to people's littering in the forest, the writer feels_________ .
[A] confused
[B] doubtful
[C] worried
[D] hopeful

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The text is probably taken from ______.
[ A] a movie review
[ B ] a book of adventures
[ C] a talk on Harry Potter
[ D] a story of Rowling ' s life

What can be inferred from the last paragraph？
[A] Whether or not to have a nucleus is important in biology.
[B ] The speaker will tell us how to distinguish bacteria tomorrow.
[ C] Evolution will be the main topic of the program next time.
[ D] Eukaryotes develop from prokaryotes.

[ A ] recently
[ B ] frequently
[ C ] realistically
[ D ] immediately

如果你发现了一株雄性不育植株。你如何确定它究竟是单倍体，远缘杂交F₁、生理不育、核不育还是细胞质不育？