The Internet is really ________ to us. We can get a lot of things from it.
A．usefulB．difficultC．differentD．safe
A

試題分析：句意：因特網(wǎng)對我們確實(shí)有用，我們可以通過它獲得很多東西。所給選項(xiàng)中A是有用的，B是困難的，C是不同的，D是安全的，根據(jù)題意此題選A。
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