Cloning plants is straightforward           cloning animals is very complicated .
A．so thatB．a(chǎn)lthoughC．whileD．a(chǎn)s if
C
詞義辨析題。A. so that 為的是   B. although 盡管  C. while 然而  D. as if 似乎 句意：克隆植物直接然而克隆動(dòng)物非常復(fù)雜。 根據(jù)語境選C
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