1.
The correct answer is (B).
The parenthetical phrase "of course" should be set off from the rest of the sentence by a pair of matching commas, one before the phrase and one after.
2.
The correct answer is (D).
This is the most concise and graceful wording.
Math
1.
The correct answer is (E).
If you sketch each of the segments on a coordinate plane, you'll find that only the segment connecting (2,1) and (2,5) intersects with the original segment.
Reading
1.
The correct answer is (A).
Paragraphs 14 and 18 make this point: "It unsettles her; it's very likely to upset her," and "Now, don't excite her after her supper."
2.
The correct answer is (B).
Paragraph 12 provides good evidence for both points. Bertha "does not dare to" criticize Nanny's handling of the baby, even indirectly; and we're told that she feels "like the poor little girl in front of the rich little girl with the doll" when she sees Nanny with Little B. Later, she expresses unhappiness over the fact that her baby is "in another woman's arms." Clearly, Bertha is both a little jealous of Nanny and a little intimidated by her.
Science
1.
The correct answer is (B).
The Hydrothermal Synthesis Hypothesis states that the PAHs (the organic molecules in the meteorite) were formed by hydrothermal synthesis, while the Primitive Life Hypothesis says that they were formed by the decay of bacteria.
2.
The correct answer is (B).
See the fourth sentence of each of the sections describing the two hypotheses. In both cases, seeping water is described as the mechanism that allowed carbon to enter the rock.