填空题

Parasites, which are smaller than their hosts, include ______.

【参考答案】

many viruses and bacteria
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填空题
Certain insects, such as the monarch butterfly, can incorporate poisonous substances found in food plants into their own tissues and use them as ______.
单项选择题
A．She enjoys standing in line.B．She would go the bank next time.C．She differs from the man.D．She would go home.
A．She enjoys standing in line.
B．She would go the bank next time.
C．She differs from the man.
D．She would go home.
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