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【单选题】
下列关于醛的说法中正确的是（ ）A.
甲醛是甲基跟醛基相连而构成的醛
B.
醛的官能团是—COH
C.
饱和一元脂肪醛的分子式符合C n H 2n O
D.
甲醛、乙醛、丙醛均无同分异构体
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【单选题】Read the article's introduction [paragraphs 1-5]. Select the paragraph from the section that explains why Sphynx cats are popular.
A.
Sphynx cats might seem a bit creepy because they do not have hair. Some say they look like naked mole rats.
B.
Sphynx are not slimy to touch, as some might think. In fact, they are about 4 degrees warmer than most other cats. They are also not truly hairless. They have a layer of soft fuzz. It is like a fresh peach.
C.
Still, owners love them most because they are so friendly. They need love more than other cats, says Maria Trimarchi. She has two Sphynx cats. "They love people so much."
D.
These cats are named for the ancient sculpture in Egypt. Yet, the Sphynx has no link to that land.
【简答题】看谁都能算对！ 70-40= 80-60= 40-20= 50+40= 90-30= 60-40= 20+10= 30+40= 10+50= 90-10= 10+30= 80+10= 60-20= 70+20= 100-30=
【简答题】计算。 10+30+50= 90-60+40= 70-20-40= 50+30-60= 60+20-40= 20+20+40=
【简答题】口算。 40+30= 80-10= 20+40= 30+20= 50+30= 70-20= 90-50= 60-40= 30+60=
【简答题】口算。 30+40= 40+10= 60-30= 80-40= 80+20= 80-30= 20+20= 90-50= 10+60= 70-30= 60-40= 40-30= 60+20= 10+70= 20+50= 30+50= 40-20= 50-30=
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