【单选题】【消耗次数：1】
在机体黏膜抗感染中起重要作用的Ig是（ ）
①
IgG
②
IgM
③
IgA
④
IgE
⑤
IgD
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阅读课文II.Which Is Stronger? 判断下列句子表述内容的正误:The Sun agreed that the Wind could force the traveller to take off his coat.
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The air became_________ .
①
cold and cold
②
colder and colder
③
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④
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Many young adults, who have had no_________ to receive further education before, are eager to develop their abilities.
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skill
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degree
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chance
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In the United States, television stations are not_________ by the government.
①
run
②
ran
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runs
④
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You remember things every day, but_________ do you do it?
①
what
②
which
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Various_________ are offered in adult educational institutions.
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courses
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cases
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calls
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cars
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When you send a letter or a postcard, you have to put_________ on th envelope or on the card.
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mails
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parcels
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receipts
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stamps