Blue－greenalgaegrowabundantlyinsaltmarshes.

• A.primarily
• B.slowly
• C.onplants(cultivate)
• D.ingreatnumbers

Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.

• A.hostile-looking
• B.perceptive
• C.primitive
• D.strangelyformed

WhileBillieHolidaydidnotinventthemusiccalled"theblues",shemostassuredlyhelpedpopularizeit.

• A.finally
• B.certainly
• C.earnestly
• D.enthusiastically

Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.

• A.hand-carved
• B.roughlymade
• C.flat
• D.heavy

Whencarbonisaddedtoironintheproperproportions,theresultissteel.

• A.container
• B.sequence
• C.laboratories
• D.amounts

Inliterature,caricatures讽刺画usuallycontainverbalexaggerationthroughwhichthewriterachievescomicandoftensatiric讽刺effects.

• A.banter取笑(tease)
• B.humor
• C.interaction
• D.overstatement